kernel: fix -Wstrict-prototypes warnings/errors

* On newer kernel for some reason -Wno-strict-prototypes still does not fix the errors or warnings.
* To fix it, we just need to add void type.

Signed-off-by: rsuntk <rsuntk@yukiprjkt.my.id>

kernel/selinux/rules.c

@@ -37,7 +37,7 @@ static struct policydb *get_policydb(void)
 }
 
 static DEFINE_MUTEX(ksu_rules);
-void apply_kernelsu_rules()
+void apply_kernelsu_rules(void)
 {
 	struct policydb *db;
 
@@ -210,7 +210,7 @@ static int get_object(char *buf, char __user *user_object, size_t buf_sz,
 }
 
 // reset avc cache table, otherwise the new rules will not take effect if already denied
-static void reset_avc_cache()
+static void reset_avc_cache(void)
 {
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 4, 0) || \
 	!defined(KSU_COMPAT_USE_SELINUX_STATE)

kernel/selinux/selinux.c

@@ -93,7 +93,7 @@ static inline u32 current_sid(void)
 }
 #endif
 
-bool is_ksu_domain()
+bool is_ksu_domain(void)
 {
 	char *domain;
 	u32 seclen;
@@ -132,7 +132,7 @@ bool is_zygote(void *sec)
 
 #define DEVPTS_DOMAIN "u:object_r:ksu_file:s0"
 
-u32 ksu_get_devpts_sid()
+u32 ksu_get_devpts_sid(void)
 {
 	u32 devpts_sid = 0;
 	int err = security_secctx_to_secid(DEVPTS_DOMAIN, strlen(DEVPTS_DOMAIN),

kernel/selinux/selinux.h

@@ -15,12 +15,12 @@ void setenforce(bool);
 
 bool getenforce(void);
 
-bool is_ksu_domain();
+bool is_ksu_domain(void);
 
 bool is_zygote(void *cred);
 
-void apply_kernelsu_rules();
+void apply_kernelsu_rules(void);
 
-u32 ksu_get_devpts_sid();
+u32 ksu_get_devpts_sid(void);
 
 #endif